Custom Liquid Silicone Rubber Waterproof Seal

# Custom Liquid Silicone Rubber Waterproof Seal

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Product Overview

Custom Liquid Silicone Rubber (LSR) Waterproof Seals (LSR waterproof rings and waterproof components) are precision-molded sealing solutions designed to prevent water, moisture, dust, and other contaminants from penetrating enclosed assemblies. Manufactured at 橡楚（湖北）橡胶有限公司, located at 湖北省鄂州市鄂城区经济开发区凡口街道内河巷54号, these custom seals leverage the inherent hydrophobic properties of liquid silicone rubber to deliver long-term reliable sealing performance across a wide range of operating conditions.

Unlike standard off-the-shelf seals, our custom LSR waterproof seals are engineered to match your exact dimensional and performance requirements, making them suitable for irregular enclosure geometries and specialized application demands that off-the-shelf options cannot accommodate. We produce custom waterproof rings, gaskets, and formed waterproof components for low to high volume production runs, with consistent quality maintained through our ISO 9001-certified quality management system.

Core selling points of our custom LSR waterproof seals include: full customizability for unique design requirements, excellent resistance to water immersion and temperature fluctuations, long-term compression set resistance for prolonged service life, and compliance with food contact, medical, and industrial material standards as requested.

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Technical Specifications

Material Properties

All our custom LSR waterproof seals are manufactured from 100% pure high-grade liquid silicone rubber, with no recycled filler material added. Key inherent material properties include:

• Inherent hydrophobicity: Non-porous surface that does not absorb water, preventing moisture ingress and water-related degradation
• Wide operating temperature range: Stable performance across -40°C to 200°C (continuous use), with short-term peak resistance up to 230°C
• Chemical resistance: Resistant to water, mild acids, alkalis, ozone, UV radiation, and common automotive/industrial fluids
• Non-toxic and odorless: Can be formulated to meet food contact and biocompatibility requirements for sensitive applications
• Low surface energy: Resists adhesion to dust, dirt, and mold growth, maintaining sealing performance in outdoor and wet environments

Physical Performance

Below are standard physical parameters for our LSR waterproof seals; custom formulations can be adjusted to meet specific requirements:

Process Parameters

Our precision LSR injection molding process supports the following production parameters for custom seals:

• Minimum wall thickness: 0.5mm
• Maximum component dimension: 300mm x 300mm
• Dimensional tolerance: ±0.05mm (for dimensions <10mm); ±0.5% (for dimensions >10mm)
• Minimum order quantity: 500 pieces for custom tooling projects
• Lead time: 10-15 working days for prototype development and first article testing; 7-10 working days for mass production after tooling approval

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Product Advantages

1. Full Customization for Unique Design Requirements

We engineer every waterproof seal to match your exact drawings and performance specifications, whether you need a simple round waterproof ring, an irregular-shaped gasket, or a complex multi-functional waterproof component. Our in-house design and tooling team can also provide design for manufacturing (DFM) feedback to optimize your seal design for improved sealing performance and lower production costs.

2. Long-Term Durability in Harsh Wet Environments

LSR’s excellent compression set resistance ensures that our seals maintain consistent contact pressure against mating surfaces even after years of compression, temperature cycling, and continuous water exposure. Unlike organic rubber seals that can crack, shrink, or swell after prolonged water exposure, our LSR waterproof seals retain their sealing performance for more than 5 years of outdoor or submerged service, reducing maintenance and replacement costs.

3. Compliance with Sensitive Application Requirements

We can formulate LSR materials to meet global regulatory standards for food contact, medical devices, and outdoor equipment, including FDA 21 CFR 177.2600 and ISO 10993 biocompatibility requirements. All materials are tested for leaching and water absorption to ensure no contamination of water supplies or sensitive internal components.

4. Cost-Effective Mass Production

Our automated liquid silicone injection molding process delivers high consistency for mass production runs, with minimal variation between individual seals. This reduces rejection rates and ensures uniform sealing performance across all units in your order, while our optimized production planning keeps lead times and production costs competitive for both low and high volume orders.

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Applications

Our custom LSR waterproof seals are used across a wide range of industries for moisture and dust protection:

• Consumer electronics: Waterproof sealing for smart watches, fitness trackers, outdoor Bluetooth speakers, power banks, and underwater photography equipment, providing IP65 to IP68 level water protection.
• Outdoor LED lighting: Sealing for LED street lights, landscape lights, flood lights, and solar panel junction boxes, preventing rain and moisture ingress to protect internal electrical components.
• Automotive and new energy vehicles: Sealing for exterior lighting, battery packs, door sensors, and under-the-hood electronic components, resisting road water, temperature fluctuations, and automotive fluid exposure.
• Medical devices: Waterproof sealing for wearable health monitors, portable medical equipment, and surgical device enclosures, compatible with repeated sterilization and bodily fluid exposure.
• Household appliances: Sealing for water purifiers, coffee machines, shower heads, and outdoor garden appliances, meeting food contact requirements and resisting continuous hot water exposure.
• Marine equipment: Sealing for boat electronics, underwater sensors, and diving equipment, maintaining performance after long-term salt water immersion.

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Selection Guide

Hardness Selection

Choosing the correct Shore hardness is critical for optimal sealing performance:

• 10 Shore A – 30 Shore A: Soft seals for low-compression assemblies, provides excellent conformability to irregular mating surfaces, suitable for static sealing applications with low clamping force.
• 30 Shore A – 50 Shore A: General purpose hardness for most static and dynamic sealing applications, balances conformability and compression resistance, suitable for most consumer electronics and outdoor lighting applications.
• 50 Shore A – 80 Shore A: High-hardness seals for high-pressure applications or dynamic sealing requirements, provides high structural rigidity and resistance to extrusion, suitable for hydraulic components and high-compression assemblies.

Size Specifications

We support any custom dimension within our 300mm x 300mm maximum molding size. When submitting your requirement, please provide:

• Full 2D CAD drawings with dimensional tolerances
• 3D CAD models for complex geometries
• Required IP protection rating to help us recommend the optimal cross-section design and compression ratio

Material Grade

Select the appropriate material grade based on your application:

• General industrial grade: Suitable for non-sensitive industrial applications, standard performance at competitive cost.
• Food contact grade: Complies with FDA 21 CFR 177.2600, suitable for kitchen appliances, water treatment equipment, and food processing machinery.
• Medical grade: Complies with ISO 10993 biocompatibility requirements, suitable for wearable medical devices and disposable medical components.
• High-temperature grade: Formulated for continuous use above 180°C, suitable for high-temperature industrial equipment and engine components.

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Quality Assurance

At 橡楚（湖北）橡胶有限公司, we maintain a strict quality management system certified to ISO 9001, with quality control checks implemented at every stage of production:

1. Incoming material inspection: Every batch of raw LSR material is tested for hardness, tensile strength, and purity before production begins.
2. In-process dimensional inspection: First article inspection is conducted for every production run, with regular sampling checks to maintain dimensional consistency.
3. Performance testing: We provide standard water immersion testing and compression set testing for all waterproof seal orders, and can provide third-party testing reports for material compliance upon request.
4. Final inspection: 100% visual inspection for surface defects, with dimensional sampling before shipment.

For any questions about custom LSR waterproof seal specifications, tooling, or pricing, please contact us at:

• Phone: +86 18071171144
• Email: churubber@163.com
• Address: No.54, Neihe Alley, Fankou Sub-district, Economic Development Zone, Echeng District, Ezhou City, Hubei Province, China